Watermelon Tourmaline, Sapphire, or Amethyst. Additional Crystal Recommendations: Muscovite, Lapis Lazuli, Lepidolite, or Turquoise. Nervousness is associated with the Solar Plexus and Heart chakras.Wear continuously or hold for 15-20 minutes until you feel relaxed. Remember to take a few deep breaths to help calm and center yourself.